In this paper, we propose a new cellular automaton model for studying the temporary bottleneck induced by a special accident. The difference in driver behavior between before and after the accident occurrences is taken into account to investigate the effect of the bottleneck on driving character. Simulation results show that the new model can reproduce some complicated traffic phenomena, such as the asymmetrically lane-changing and grabbing the entrance on the bottleneck, and a reasonable asymmetrically gear-alternating control regulation can enhance the outflow of the bottleneck.